Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * Copyright (C) 1991, 1992 Linus Torvalds |
Alexander van Heukelum | a8c1be9 | 2008-07-02 01:29:44 +0200 | [diff] [blame] | 3 | * Copyright (C) 2000, 2001, 2002 Andi Kleen, SuSE Labs |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * Pentium III FXSR, SSE support |
| 6 | * Gareth Hughes <gareth@valinux.com>, May 2000 |
| 7 | */ |
| 8 | |
| 9 | /* |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 10 | * Handle hardware traps and faults. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | */ |
Joe Perches | c767a54 | 2012-05-21 19:50:07 -0700 | [diff] [blame] | 12 | |
| 13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| 14 | |
Frederic Weisbecker | 56dd947 | 2013-02-24 00:23:25 +0100 | [diff] [blame] | 15 | #include <linux/context_tracking.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 16 | #include <linux/interrupt.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | #include <linux/kallsyms.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 18 | #include <linux/spinlock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/kprobes.h> |
Andrew Morton | 1e2af92 | 2006-09-27 01:51:15 -0700 | [diff] [blame] | 20 | #include <linux/uaccess.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 21 | #include <linux/kdebug.h> |
Jason Wessel | f503b5a | 2010-05-20 21:04:25 -0500 | [diff] [blame] | 22 | #include <linux/kgdb.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 23 | #include <linux/kernel.h> |
| 24 | #include <linux/module.h> |
| 25 | #include <linux/ptrace.h> |
| 26 | #include <linux/string.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 27 | #include <linux/delay.h> |
| 28 | #include <linux/errno.h> |
| 29 | #include <linux/kexec.h> |
| 30 | #include <linux/sched.h> |
| 31 | #include <linux/timer.h> |
| 32 | #include <linux/init.h> |
Jeremy Fitzhardinge | 91768d6 | 2006-12-08 02:36:21 -0800 | [diff] [blame] | 33 | #include <linux/bug.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 34 | #include <linux/nmi.h> |
| 35 | #include <linux/mm.h> |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 36 | #include <linux/smp.h> |
| 37 | #include <linux/io.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | #ifdef CONFIG_EISA |
| 40 | #include <linux/ioport.h> |
| 41 | #include <linux/eisa.h> |
| 42 | #endif |
| 43 | |
Dave Jiang | c0d1217 | 2007-07-19 01:49:46 -0700 | [diff] [blame] | 44 | #if defined(CONFIG_EDAC) |
| 45 | #include <linux/edac.h> |
| 46 | #endif |
| 47 | |
Vegard Nossum | f856129 | 2008-04-04 00:53:23 +0200 | [diff] [blame] | 48 | #include <asm/kmemcheck.h> |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 49 | #include <asm/stacktrace.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #include <asm/processor.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | #include <asm/debugreg.h> |
Arun Sharma | 60063497 | 2011-07-26 16:09:06 -0700 | [diff] [blame] | 52 | #include <linux/atomic.h> |
Steven Rostedt | 08d636b | 2011-08-16 09:57:10 -0400 | [diff] [blame] | 53 | #include <asm/ftrace.h> |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 54 | #include <asm/traps.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | #include <asm/desc.h> |
| 56 | #include <asm/i387.h> |
Linus Torvalds | 1361b83 | 2012-02-21 13:19:22 -0800 | [diff] [blame] | 57 | #include <asm/fpu-internal.h> |
Hidetoshi Seto | 9e55e44 | 2009-06-15 17:22:15 +0900 | [diff] [blame] | 58 | #include <asm/mce.h> |
Kees Cook | 4eefbe7 | 2013-04-10 12:24:22 -0700 | [diff] [blame] | 59 | #include <asm/fixmap.h> |
Ingo Molnar | 1164dd0 | 2009-01-28 19:34:09 +0100 | [diff] [blame] | 60 | #include <asm/mach_traps.h> |
Jiri Kosina | 17f4157 | 2013-07-23 10:09:28 +0200 | [diff] [blame] | 61 | #include <asm/alternative.h> |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 62 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 63 | #ifdef CONFIG_X86_64 |
Thomas Gleixner | 428cf90 | 2009-08-20 10:35:46 +0200 | [diff] [blame] | 64 | #include <asm/x86_init.h> |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 65 | #include <asm/pgalloc.h> |
| 66 | #include <asm/proto.h> |
Kees Cook | 4df05f3 | 2013-07-16 11:34:41 -0700 | [diff] [blame] | 67 | |
| 68 | /* No need to be aligned, but done to keep all IDTs defined the same way. */ |
| 69 | gate_desc debug_idt_table[NR_VECTORS] __page_aligned_bss; |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 70 | #else |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 71 | #include <asm/processor-flags.h> |
Ingo Molnar | 8e6dafd | 2009-02-23 00:34:39 +0100 | [diff] [blame] | 72 | #include <asm/setup.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 74 | asmlinkage int system_call(void); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 75 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 76 | |
Kees Cook | 4df05f3 | 2013-07-16 11:34:41 -0700 | [diff] [blame] | 77 | /* Must be page-aligned because the real IDT is used in a fixmap. */ |
| 78 | gate_desc idt_table[NR_VECTORS] __page_aligned_bss; |
| 79 | |
Yinghai Lu | b77b881 | 2008-12-19 15:23:44 -0800 | [diff] [blame] | 80 | DECLARE_BITMAP(used_vectors, NR_VECTORS); |
| 81 | EXPORT_SYMBOL_GPL(used_vectors); |
| 82 | |
Alexander van Heukelum | 762db43 | 2008-09-09 21:55:55 +0200 | [diff] [blame] | 83 | static inline void conditional_sti(struct pt_regs *regs) |
| 84 | { |
| 85 | if (regs->flags & X86_EFLAGS_IF) |
| 86 | local_irq_enable(); |
| 87 | } |
| 88 | |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 89 | static inline void preempt_conditional_sti(struct pt_regs *regs) |
| 90 | { |
Peter Zijlstra | bdb4380 | 2013-09-10 12:15:23 +0200 | [diff] [blame] | 91 | preempt_count_inc(); |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 92 | if (regs->flags & X86_EFLAGS_IF) |
| 93 | local_irq_enable(); |
| 94 | } |
| 95 | |
Thomas Gleixner | be71661 | 2009-01-13 23:36:34 +0100 | [diff] [blame] | 96 | static inline void conditional_cli(struct pt_regs *regs) |
| 97 | { |
| 98 | if (regs->flags & X86_EFLAGS_IF) |
| 99 | local_irq_disable(); |
| 100 | } |
| 101 | |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 102 | static inline void preempt_conditional_cli(struct pt_regs *regs) |
| 103 | { |
| 104 | if (regs->flags & X86_EFLAGS_IF) |
| 105 | local_irq_disable(); |
Peter Zijlstra | bdb4380 | 2013-09-10 12:15:23 +0200 | [diff] [blame] | 106 | preempt_count_dec(); |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 107 | } |
| 108 | |
Frederic Weisbecker | c416ddf | 2012-09-25 14:51:19 +0200 | [diff] [blame] | 109 | static int __kprobes |
| 110 | do_trap_no_signal(struct task_struct *tsk, int trapnr, char *str, |
| 111 | struct pt_regs *regs, long error_code) |
| 112 | { |
| 113 | #ifdef CONFIG_X86_32 |
| 114 | if (regs->flags & X86_VM_MASK) { |
| 115 | /* |
| 116 | * Traps 0, 1, 3, 4, and 5 should be forwarded to vm86. |
| 117 | * On nmi (interrupt 2), do_trap should not be called. |
| 118 | */ |
| 119 | if (trapnr < X86_TRAP_UD) { |
| 120 | if (!handle_vm86_trap((struct kernel_vm86_regs *) regs, |
| 121 | error_code, trapnr)) |
| 122 | return 0; |
| 123 | } |
| 124 | return -1; |
| 125 | } |
| 126 | #endif |
| 127 | if (!user_mode(regs)) { |
| 128 | if (!fixup_exception(regs)) { |
| 129 | tsk->thread.error_code = error_code; |
| 130 | tsk->thread.trap_nr = trapnr; |
| 131 | die(str, regs, error_code); |
| 132 | } |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | return -1; |
| 137 | } |
| 138 | |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 139 | static void __kprobes |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 140 | do_trap(int trapnr, int signr, char *str, struct pt_regs *regs, |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 141 | long error_code, siginfo_t *info) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | { |
Alexander Nyberg | 4f339ec | 2005-06-25 14:58:27 -0700 | [diff] [blame] | 143 | struct task_struct *tsk = current; |
Alexander Nyberg | 4f339ec | 2005-06-25 14:58:27 -0700 | [diff] [blame] | 144 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
Frederic Weisbecker | c416ddf | 2012-09-25 14:51:19 +0200 | [diff] [blame] | 146 | if (!do_trap_no_signal(tsk, trapnr, str, regs, error_code)) |
| 147 | return; |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 148 | /* |
Srikar Dronamraju | 51e7dc7 | 2012-03-12 14:55:55 +0530 | [diff] [blame] | 149 | * We want error_code and trap_nr set for userspace faults and |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 150 | * kernelspace faults which result in die(), but not |
| 151 | * kernelspace faults which are fixed up. die() gives the |
| 152 | * process no chance to handle the signal and notice the |
| 153 | * kernel fault information, so that won't result in polluting |
| 154 | * the information about previously queued, but not yet |
| 155 | * delivered, faults. See also do_general_protection below. |
| 156 | */ |
| 157 | tsk->thread.error_code = error_code; |
Srikar Dronamraju | 51e7dc7 | 2012-03-12 14:55:55 +0530 | [diff] [blame] | 158 | tsk->thread.trap_nr = trapnr; |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 159 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 160 | #ifdef CONFIG_X86_64 |
| 161 | if (show_unhandled_signals && unhandled_signal(tsk, signr) && |
| 162 | printk_ratelimit()) { |
Joe Perches | c767a54 | 2012-05-21 19:50:07 -0700 | [diff] [blame] | 163 | pr_info("%s[%d] trap %s ip:%lx sp:%lx error:%lx", |
| 164 | tsk->comm, tsk->pid, str, |
| 165 | regs->ip, regs->sp, error_code); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 166 | print_vma_addr(" in ", regs->ip); |
Joe Perches | c767a54 | 2012-05-21 19:50:07 -0700 | [diff] [blame] | 167 | pr_cont("\n"); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 168 | } |
| 169 | #endif |
| 170 | |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 171 | if (info) |
| 172 | force_sig_info(signr, info, tsk); |
| 173 | else |
| 174 | force_sig(signr, tsk); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | } |
| 176 | |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 177 | #define DO_ERROR(trapnr, signr, str, name) \ |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 178 | dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 179 | { \ |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 180 | enum ctx_state prev_state; \ |
| 181 | \ |
| 182 | prev_state = exception_enter(); \ |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 183 | if (notify_die(DIE_TRAP, str, regs, error_code, \ |
| 184 | trapnr, signr) == NOTIFY_STOP) { \ |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 185 | exception_exit(prev_state); \ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 186 | return; \ |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 187 | } \ |
Alexander van Heukelum | 61aef7d | 2008-09-09 21:55:56 +0200 | [diff] [blame] | 188 | conditional_sti(regs); \ |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 189 | do_trap(trapnr, signr, str, regs, error_code, NULL); \ |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 190 | exception_exit(prev_state); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | } |
| 192 | |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 193 | #define DO_ERROR_INFO(trapnr, signr, str, name, sicode, siaddr) \ |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 194 | dotraplinkage void do_##name(struct pt_regs *regs, long error_code) \ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 195 | { \ |
| 196 | siginfo_t info; \ |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 197 | enum ctx_state prev_state; \ |
| 198 | \ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 199 | info.si_signo = signr; \ |
| 200 | info.si_errno = 0; \ |
| 201 | info.si_code = sicode; \ |
| 202 | info.si_addr = (void __user *)siaddr; \ |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 203 | prev_state = exception_enter(); \ |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 204 | if (notify_die(DIE_TRAP, str, regs, error_code, \ |
| 205 | trapnr, signr) == NOTIFY_STOP) { \ |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 206 | exception_exit(prev_state); \ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 207 | return; \ |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 208 | } \ |
Alexander van Heukelum | 61aef7d | 2008-09-09 21:55:56 +0200 | [diff] [blame] | 209 | conditional_sti(regs); \ |
Alexander van Heukelum | 3c1326f | 2008-09-26 14:03:08 +0200 | [diff] [blame] | 210 | do_trap(trapnr, signr, str, regs, error_code, &info); \ |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 211 | exception_exit(prev_state); \ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | } |
| 213 | |
Ingo Molnar | d8af4ce | 2013-12-12 14:46:42 +0100 | [diff] [blame] | 214 | DO_ERROR_INFO(X86_TRAP_DE, SIGFPE, "divide error", divide_error, FPE_INTDIV, regs->ip ) |
| 215 | DO_ERROR (X86_TRAP_OF, SIGSEGV, "overflow", overflow ) |
| 216 | DO_ERROR (X86_TRAP_BR, SIGSEGV, "bounds", bounds ) |
| 217 | DO_ERROR_INFO(X86_TRAP_UD, SIGILL, "invalid opcode", invalid_op, ILL_ILLOPN, regs->ip ) |
| 218 | DO_ERROR (X86_TRAP_OLD_MF, SIGFPE, "coprocessor segment overrun", coprocessor_segment_overrun ) |
| 219 | DO_ERROR (X86_TRAP_TS, SIGSEGV, "invalid TSS", invalid_TSS ) |
| 220 | DO_ERROR (X86_TRAP_NP, SIGBUS, "segment not present", segment_not_present ) |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 221 | #ifdef CONFIG_X86_32 |
Ingo Molnar | d8af4ce | 2013-12-12 14:46:42 +0100 | [diff] [blame] | 222 | DO_ERROR (X86_TRAP_SS, SIGBUS, "stack segment", stack_segment ) |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 223 | #endif |
Ingo Molnar | d8af4ce | 2013-12-12 14:46:42 +0100 | [diff] [blame] | 224 | DO_ERROR_INFO(X86_TRAP_AC, SIGBUS, "alignment check", alignment_check, BUS_ADRALN, 0 ) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 225 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 226 | #ifdef CONFIG_X86_64 |
| 227 | /* Runs on IST stack */ |
| 228 | dotraplinkage void do_stack_segment(struct pt_regs *regs, long error_code) |
| 229 | { |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 230 | enum ctx_state prev_state; |
| 231 | |
| 232 | prev_state = exception_enter(); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 233 | if (notify_die(DIE_TRAP, "stack segment", regs, error_code, |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 234 | X86_TRAP_SS, SIGBUS) != NOTIFY_STOP) { |
| 235 | preempt_conditional_sti(regs); |
| 236 | do_trap(X86_TRAP_SS, SIGBUS, "stack segment", regs, error_code, NULL); |
| 237 | preempt_conditional_cli(regs); |
| 238 | } |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 239 | exception_exit(prev_state); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 240 | } |
| 241 | |
| 242 | dotraplinkage void do_double_fault(struct pt_regs *regs, long error_code) |
| 243 | { |
| 244 | static const char str[] = "double fault"; |
| 245 | struct task_struct *tsk = current; |
| 246 | |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 247 | exception_enter(); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 248 | /* Return not checked because double check cannot be ignored */ |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 249 | notify_die(DIE_TRAP, str, regs, error_code, X86_TRAP_DF, SIGSEGV); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 250 | |
| 251 | tsk->thread.error_code = error_code; |
Srikar Dronamraju | 51e7dc7 | 2012-03-12 14:55:55 +0530 | [diff] [blame] | 252 | tsk->thread.trap_nr = X86_TRAP_DF; |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 253 | |
Borislav Petkov | 4d067d8 | 2013-05-09 12:02:29 +0200 | [diff] [blame] | 254 | #ifdef CONFIG_DOUBLEFAULT |
| 255 | df_debug(regs, error_code); |
| 256 | #endif |
Ingo Molnar | bd8b96d | 2008-12-26 09:20:22 +0100 | [diff] [blame] | 257 | /* |
| 258 | * This is always a kernel trap and never fixable (and thus must |
| 259 | * never return). |
| 260 | */ |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 261 | for (;;) |
| 262 | die(str, regs, error_code); |
| 263 | } |
| 264 | #endif |
| 265 | |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 266 | dotraplinkage void __kprobes |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 267 | do_general_protection(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 268 | { |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 269 | struct task_struct *tsk; |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 270 | enum ctx_state prev_state; |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 271 | |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 272 | prev_state = exception_enter(); |
Alexander van Heukelum | c6df0d7 | 2008-09-09 21:56:07 +0200 | [diff] [blame] | 273 | conditional_sti(regs); |
| 274 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 275 | #ifdef CONFIG_X86_32 |
Frederic Weisbecker | ef3f628 | 2012-09-24 21:05:52 +0200 | [diff] [blame] | 276 | if (regs->flags & X86_VM_MASK) { |
| 277 | local_irq_enable(); |
| 278 | handle_vm86_fault((struct kernel_vm86_regs *) regs, error_code); |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 279 | goto exit; |
Frederic Weisbecker | ef3f628 | 2012-09-24 21:05:52 +0200 | [diff] [blame] | 280 | } |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 281 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 282 | |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 283 | tsk = current; |
Frederic Weisbecker | ef3f628 | 2012-09-24 21:05:52 +0200 | [diff] [blame] | 284 | if (!user_mode(regs)) { |
| 285 | if (fixup_exception(regs)) |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 286 | goto exit; |
Frederic Weisbecker | ef3f628 | 2012-09-24 21:05:52 +0200 | [diff] [blame] | 287 | |
| 288 | tsk->thread.error_code = error_code; |
| 289 | tsk->thread.trap_nr = X86_TRAP_GP; |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 290 | if (notify_die(DIE_GPF, "general protection fault", regs, error_code, |
| 291 | X86_TRAP_GP, SIGSEGV) != NOTIFY_STOP) |
Frederic Weisbecker | ef3f628 | 2012-09-24 21:05:52 +0200 | [diff] [blame] | 292 | die("general protection fault", regs, error_code); |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 293 | goto exit; |
Frederic Weisbecker | ef3f628 | 2012-09-24 21:05:52 +0200 | [diff] [blame] | 294 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 296 | tsk->thread.error_code = error_code; |
Srikar Dronamraju | 51e7dc7 | 2012-03-12 14:55:55 +0530 | [diff] [blame] | 297 | tsk->thread.trap_nr = X86_TRAP_GP; |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 298 | |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 299 | if (show_unhandled_signals && unhandled_signal(tsk, SIGSEGV) && |
| 300 | printk_ratelimit()) { |
Joe Perches | c767a54 | 2012-05-21 19:50:07 -0700 | [diff] [blame] | 301 | pr_info("%s[%d] general protection ip:%lx sp:%lx error:%lx", |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 302 | tsk->comm, task_pid_nr(tsk), |
| 303 | regs->ip, regs->sp, error_code); |
Andi Kleen | 0325291 | 2008-01-30 13:33:18 +0100 | [diff] [blame] | 304 | print_vma_addr(" in ", regs->ip); |
Joe Perches | c767a54 | 2012-05-21 19:50:07 -0700 | [diff] [blame] | 305 | pr_cont("\n"); |
Andi Kleen | 0325291 | 2008-01-30 13:33:18 +0100 | [diff] [blame] | 306 | } |
Masoud Asgharifard Sharbiani | abd4f75 | 2007-07-22 11:12:28 +0200 | [diff] [blame] | 307 | |
Alexander van Heukelum | 13485ab | 2008-07-02 01:32:04 +0200 | [diff] [blame] | 308 | force_sig(SIGSEGV, tsk); |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 309 | exit: |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 310 | exception_exit(prev_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | } |
| 312 | |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 313 | /* May run on IST stack. */ |
Steven Rostedt | 08d636b | 2011-08-16 09:57:10 -0400 | [diff] [blame] | 314 | dotraplinkage void __kprobes notrace do_int3(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | { |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 316 | enum ctx_state prev_state; |
| 317 | |
Steven Rostedt | 08d636b | 2011-08-16 09:57:10 -0400 | [diff] [blame] | 318 | #ifdef CONFIG_DYNAMIC_FTRACE |
Steven Rostedt | a192cd0 | 2012-05-30 13:26:37 -0400 | [diff] [blame] | 319 | /* |
| 320 | * ftrace must be first, everything else may cause a recursive crash. |
| 321 | * See note by declaration of modifying_ftrace_code in ftrace.c |
| 322 | */ |
| 323 | if (unlikely(atomic_read(&modifying_ftrace_code)) && |
| 324 | ftrace_int3_handler(regs)) |
Steven Rostedt | 08d636b | 2011-08-16 09:57:10 -0400 | [diff] [blame] | 325 | return; |
| 326 | #endif |
Jiri Kosina | 17f4157 | 2013-07-23 10:09:28 +0200 | [diff] [blame] | 327 | if (poke_int3_handler(regs)) |
| 328 | return; |
| 329 | |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 330 | prev_state = exception_enter(); |
Jason Wessel | f503b5a | 2010-05-20 21:04:25 -0500 | [diff] [blame] | 331 | #ifdef CONFIG_KGDB_LOW_LEVEL_TRAP |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 332 | if (kgdb_ll_trap(DIE_INT3, "int3", regs, error_code, X86_TRAP_BP, |
| 333 | SIGTRAP) == NOTIFY_STOP) |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 334 | goto exit; |
Jason Wessel | f503b5a | 2010-05-20 21:04:25 -0500 | [diff] [blame] | 335 | #endif /* CONFIG_KGDB_LOW_LEVEL_TRAP */ |
Srikar Dronamraju | cc3a1bf | 2011-10-25 19:51:59 +0530 | [diff] [blame] | 336 | |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 337 | if (notify_die(DIE_INT3, "int3", regs, error_code, X86_TRAP_BP, |
| 338 | SIGTRAP) == NOTIFY_STOP) |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 339 | goto exit; |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 340 | |
Steven Rostedt | 4218118 | 2011-12-16 11:43:02 -0500 | [diff] [blame] | 341 | /* |
| 342 | * Let others (NMI) know that the debug stack is in use |
| 343 | * as we may switch to the interrupt stack. |
| 344 | */ |
| 345 | debug_stack_usage_inc(); |
Alexander van Heukelum | 4915a35 | 2008-10-03 22:00:34 +0200 | [diff] [blame] | 346 | preempt_conditional_sti(regs); |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 347 | do_trap(X86_TRAP_BP, SIGTRAP, "int3", regs, error_code, NULL); |
Alexander van Heukelum | 4915a35 | 2008-10-03 22:00:34 +0200 | [diff] [blame] | 348 | preempt_conditional_cli(regs); |
Steven Rostedt | 4218118 | 2011-12-16 11:43:02 -0500 | [diff] [blame] | 349 | debug_stack_usage_dec(); |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 350 | exit: |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 351 | exception_exit(prev_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 352 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 353 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 354 | #ifdef CONFIG_X86_64 |
Ingo Molnar | bd8b96d | 2008-12-26 09:20:22 +0100 | [diff] [blame] | 355 | /* |
| 356 | * Help handler running on IST stack to switch back to user stack |
| 357 | * for scheduling or signal handling. The actual stack switch is done in |
| 358 | * entry.S |
| 359 | */ |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 360 | asmlinkage __kprobes struct pt_regs *sync_regs(struct pt_regs *eregs) |
| 361 | { |
| 362 | struct pt_regs *regs = eregs; |
| 363 | /* Did already sync */ |
| 364 | if (eregs == (struct pt_regs *)eregs->sp) |
| 365 | ; |
| 366 | /* Exception from user space */ |
| 367 | else if (user_mode(eregs)) |
| 368 | regs = task_pt_regs(current); |
Ingo Molnar | bd8b96d | 2008-12-26 09:20:22 +0100 | [diff] [blame] | 369 | /* |
| 370 | * Exception from kernel and interrupts are enabled. Move to |
| 371 | * kernel process stack. |
| 372 | */ |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 373 | else if (eregs->flags & X86_EFLAGS_IF) |
| 374 | regs = (struct pt_regs *)(eregs->sp -= sizeof(struct pt_regs)); |
| 375 | if (eregs != regs) |
| 376 | *regs = *eregs; |
| 377 | return regs; |
| 378 | } |
| 379 | #endif |
| 380 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | /* |
| 382 | * Our handling of the processor debug registers is non-trivial. |
| 383 | * We do not clear them on entry and exit from the kernel. Therefore |
| 384 | * it is possible to get a watchpoint trap here from inside the kernel. |
| 385 | * However, the code in ./ptrace.c has ensured that the user can |
| 386 | * only set watchpoints on userspace addresses. Therefore the in-kernel |
| 387 | * watchpoint trap can only occur in code which is reading/writing |
| 388 | * from user space. Such code must not hold kernel locks (since it |
| 389 | * can equally take a page fault), therefore it is safe to call |
| 390 | * force_sig_info even though that claims and releases locks. |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 391 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 392 | * Code in ./signal.c ensures that the debug control register |
| 393 | * is restored before we deliver any signal, and therefore that |
| 394 | * user code runs with the correct debug control register even though |
| 395 | * we clear it here. |
| 396 | * |
| 397 | * Being careful here means that we don't have to be as careful in a |
| 398 | * lot of more complicated places (task switching can be a bit lazy |
| 399 | * about restoring all the debug state, and ptrace doesn't have to |
| 400 | * find every occurrence of the TF bit that could be saved away even |
| 401 | * by user code) |
Alexander van Heukelum | c1d518c | 2008-10-03 23:17:11 +0200 | [diff] [blame] | 402 | * |
| 403 | * May run on IST stack. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | */ |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 405 | dotraplinkage void __kprobes do_debug(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | struct task_struct *tsk = current; |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 408 | enum ctx_state prev_state; |
Frederic Weisbecker | a1e80fa | 2010-06-30 15:09:06 +0200 | [diff] [blame] | 409 | int user_icebp = 0; |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 410 | unsigned long dr6; |
Srinivasa Ds | da654b7 | 2008-09-23 15:23:52 +0530 | [diff] [blame] | 411 | int si_code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 413 | prev_state = exception_enter(); |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 414 | |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 415 | get_debugreg(dr6, 6); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | |
K.Prasad | 40f9249 | 2010-01-28 16:44:01 +0530 | [diff] [blame] | 417 | /* Filter out all the reserved bits which are preset to 1 */ |
| 418 | dr6 &= ~DR6_RESERVED; |
| 419 | |
Frederic Weisbecker | a1e80fa | 2010-06-30 15:09:06 +0200 | [diff] [blame] | 420 | /* |
| 421 | * If dr6 has no reason to give us about the origin of this trap, |
| 422 | * then it's very likely the result of an icebp/int01 trap. |
| 423 | * User wants a sigtrap for that. |
| 424 | */ |
| 425 | if (!dr6 && user_mode(regs)) |
| 426 | user_icebp = 1; |
| 427 | |
Vegard Nossum | f856129 | 2008-04-04 00:53:23 +0200 | [diff] [blame] | 428 | /* Catch kmemcheck conditions first of all! */ |
Ingo Molnar | eadb8a0 | 2009-06-17 12:52:15 +0200 | [diff] [blame] | 429 | if ((dr6 & DR_STEP) && kmemcheck_trap(regs)) |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 430 | goto exit; |
Vegard Nossum | f856129 | 2008-04-04 00:53:23 +0200 | [diff] [blame] | 431 | |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 432 | /* DR6 may or may not be cleared by the CPU */ |
| 433 | set_debugreg(0, 6); |
Roland McGrath | 10faa81 | 2008-01-30 13:30:54 +0100 | [diff] [blame] | 434 | |
Peter Zijlstra | ea8e61b | 2010-03-25 14:51:51 +0100 | [diff] [blame] | 435 | /* |
| 436 | * The processor cleared BTF, so don't mark that we need it set. |
| 437 | */ |
| 438 | clear_tsk_thread_flag(tsk, TIF_BLOCKSTEP); |
| 439 | |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 440 | /* Store the virtualized DR6 value */ |
| 441 | tsk->thread.debugreg6 = dr6; |
| 442 | |
Rusty Russell | 5a802e1 | 2013-06-16 14:12:47 +0930 | [diff] [blame] | 443 | if (notify_die(DIE_DEBUG, "debug", regs, (long)&dr6, error_code, |
K.Prasad | 62edab9 | 2009-06-01 23:47:06 +0530 | [diff] [blame] | 444 | SIGTRAP) == NOTIFY_STOP) |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 445 | goto exit; |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 446 | |
Steven Rostedt | 4218118 | 2011-12-16 11:43:02 -0500 | [diff] [blame] | 447 | /* |
| 448 | * Let others (NMI) know that the debug stack is in use |
| 449 | * as we may switch to the interrupt stack. |
| 450 | */ |
| 451 | debug_stack_usage_inc(); |
| 452 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 453 | /* It's safe to allow irq's after DR6 has been saved */ |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 454 | preempt_conditional_sti(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 455 | |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 456 | if (regs->flags & X86_VM_MASK) { |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 457 | handle_vm86_trap((struct kernel_vm86_regs *) regs, error_code, |
| 458 | X86_TRAP_DB); |
Bart Oldeman | 6554287 | 2010-09-23 13:16:58 -0400 | [diff] [blame] | 459 | preempt_conditional_cli(regs); |
Steven Rostedt | 4218118 | 2011-12-16 11:43:02 -0500 | [diff] [blame] | 460 | debug_stack_usage_dec(); |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 461 | goto exit; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | } |
| 463 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | /* |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 465 | * Single-stepping through system calls: ignore any exceptions in |
| 466 | * kernel space, but re-enable TF when returning to user mode. |
| 467 | * |
| 468 | * We already checked v86 mode above, so we can check for kernel mode |
| 469 | * by just checking the CPL of CS. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | */ |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 471 | if ((dr6 & DR_STEP) && !user_mode(regs)) { |
| 472 | tsk->thread.debugreg6 &= ~DR_STEP; |
| 473 | set_tsk_thread_flag(tsk, TIF_SINGLESTEP); |
| 474 | regs->flags &= ~X86_EFLAGS_TF; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | } |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 476 | si_code = get_si_code(tsk->thread.debugreg6); |
Frederic Weisbecker | a1e80fa | 2010-06-30 15:09:06 +0200 | [diff] [blame] | 477 | if (tsk->thread.debugreg6 & (DR_STEP | DR_TRAP_BITS) || user_icebp) |
K.Prasad | 08d6832 | 2009-06-01 23:44:08 +0530 | [diff] [blame] | 478 | send_sigtrap(tsk, regs, error_code, si_code); |
Alexander van Heukelum | 3d2a71a | 2008-09-30 18:41:37 +0200 | [diff] [blame] | 479 | preempt_conditional_cli(regs); |
Steven Rostedt | 4218118 | 2011-12-16 11:43:02 -0500 | [diff] [blame] | 480 | debug_stack_usage_dec(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 481 | |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 482 | exit: |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 483 | exception_exit(prev_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | } |
| 485 | |
| 486 | /* |
| 487 | * Note that we play around with the 'TS' bit in an attempt to get |
| 488 | * the correct behaviour even in the presence of the asynchronous |
| 489 | * IRQ13 behaviour |
| 490 | */ |
Oleg Nesterov | 5e1b05b | 2014-05-08 20:34:00 +0200 | [diff] [blame^] | 491 | static void math_error(struct pt_regs *regs, int error_code, int trapnr) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | { |
Brian Gerst | e2e75c9 | 2010-03-21 09:00:45 -0400 | [diff] [blame] | 493 | struct task_struct *task = current; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | siginfo_t info; |
Brian Gerst | 9b6dba9 | 2010-03-21 09:00:44 -0400 | [diff] [blame] | 495 | unsigned short err; |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 496 | char *str = (trapnr == X86_TRAP_MF) ? "fpu exception" : |
| 497 | "simd exception"; |
Brian Gerst | e2e75c9 | 2010-03-21 09:00:45 -0400 | [diff] [blame] | 498 | |
| 499 | if (notify_die(DIE_TRAP, str, regs, error_code, trapnr, SIGFPE) == NOTIFY_STOP) |
| 500 | return; |
| 501 | conditional_sti(regs); |
| 502 | |
| 503 | if (!user_mode_vm(regs)) |
| 504 | { |
| 505 | if (!fixup_exception(regs)) { |
| 506 | task->thread.error_code = error_code; |
Srikar Dronamraju | 51e7dc7 | 2012-03-12 14:55:55 +0530 | [diff] [blame] | 507 | task->thread.trap_nr = trapnr; |
Brian Gerst | e2e75c9 | 2010-03-21 09:00:45 -0400 | [diff] [blame] | 508 | die(str, regs, error_code); |
| 509 | } |
| 510 | return; |
| 511 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | |
| 513 | /* |
| 514 | * Save the info for the exception handler and clear the error. |
| 515 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 516 | save_init_fpu(task); |
Srikar Dronamraju | 51e7dc7 | 2012-03-12 14:55:55 +0530 | [diff] [blame] | 517 | task->thread.trap_nr = trapnr; |
Brian Gerst | 9b6dba9 | 2010-03-21 09:00:44 -0400 | [diff] [blame] | 518 | task->thread.error_code = error_code; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | info.si_signo = SIGFPE; |
| 520 | info.si_errno = 0; |
Brian Gerst | 9b6dba9 | 2010-03-21 09:00:44 -0400 | [diff] [blame] | 521 | info.si_addr = (void __user *)regs->ip; |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 522 | if (trapnr == X86_TRAP_MF) { |
Brian Gerst | 9b6dba9 | 2010-03-21 09:00:44 -0400 | [diff] [blame] | 523 | unsigned short cwd, swd; |
| 524 | /* |
| 525 | * (~cwd & swd) will mask out exceptions that are not set to unmasked |
| 526 | * status. 0x3f is the exception bits in these regs, 0x200 is the |
| 527 | * C1 reg you need in case of a stack fault, 0x040 is the stack |
| 528 | * fault bit. We should only be taking one exception at a time, |
| 529 | * so if this combination doesn't produce any single exception, |
| 530 | * then we have a bad program that isn't synchronizing its FPU usage |
| 531 | * and it will suffer the consequences since we won't be able to |
| 532 | * fully reproduce the context of the exception |
| 533 | */ |
| 534 | cwd = get_fpu_cwd(task); |
| 535 | swd = get_fpu_swd(task); |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 536 | |
Brian Gerst | 9b6dba9 | 2010-03-21 09:00:44 -0400 | [diff] [blame] | 537 | err = swd & ~cwd; |
| 538 | } else { |
| 539 | /* |
| 540 | * The SIMD FPU exceptions are handled a little differently, as there |
| 541 | * is only a single status/control register. Thus, to determine which |
| 542 | * unmasked exception was caught we must mask the exception mask bits |
| 543 | * at 0x1f80, and then use these to mask the exception bits at 0x3f. |
| 544 | */ |
| 545 | unsigned short mxcsr = get_fpu_mxcsr(task); |
| 546 | err = ~(mxcsr >> 7) & mxcsr; |
| 547 | } |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 548 | |
| 549 | if (err & 0x001) { /* Invalid op */ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 550 | /* |
| 551 | * swd & 0x240 == 0x040: Stack Underflow |
| 552 | * swd & 0x240 == 0x240: Stack Overflow |
| 553 | * User must clear the SF bit (0x40) if set |
| 554 | */ |
| 555 | info.si_code = FPE_FLTINV; |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 556 | } else if (err & 0x004) { /* Divide by Zero */ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 557 | info.si_code = FPE_FLTDIV; |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 558 | } else if (err & 0x008) { /* Overflow */ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 559 | info.si_code = FPE_FLTOVF; |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 560 | } else if (err & 0x012) { /* Denormal, Underflow */ |
| 561 | info.si_code = FPE_FLTUND; |
| 562 | } else if (err & 0x020) { /* Precision */ |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 563 | info.si_code = FPE_FLTRES; |
H. Peter Anvin | adf77ba | 2008-12-22 17:56:05 -0800 | [diff] [blame] | 564 | } else { |
Ingo Molnar | bd8b96d | 2008-12-26 09:20:22 +0100 | [diff] [blame] | 565 | /* |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 566 | * If we're using IRQ 13, or supposedly even some trap |
| 567 | * X86_TRAP_MF implementations, it's possible |
| 568 | * we get a spurious trap, which is not an error. |
Ingo Molnar | bd8b96d | 2008-12-26 09:20:22 +0100 | [diff] [blame] | 569 | */ |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 570 | return; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | } |
| 572 | force_sig_info(SIGFPE, &info, task); |
| 573 | } |
| 574 | |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 575 | dotraplinkage void do_coprocessor_error(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 576 | { |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 577 | enum ctx_state prev_state; |
| 578 | |
| 579 | prev_state = exception_enter(); |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 580 | math_error(regs, error_code, X86_TRAP_MF); |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 581 | exception_exit(prev_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 582 | } |
| 583 | |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 584 | dotraplinkage void |
| 585 | do_simd_coprocessor_error(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 586 | { |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 587 | enum ctx_state prev_state; |
| 588 | |
| 589 | prev_state = exception_enter(); |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 590 | math_error(regs, error_code, X86_TRAP_XF); |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 591 | exception_exit(prev_state); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 592 | } |
| 593 | |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 594 | dotraplinkage void |
| 595 | do_spurious_interrupt_bug(struct pt_regs *regs, long error_code) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 596 | { |
Alexander van Heukelum | cf81978 | 2008-09-09 21:56:08 +0200 | [diff] [blame] | 597 | conditional_sti(regs); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 598 | #if 0 |
| 599 | /* No need to warn about this any longer. */ |
Joe Perches | c767a54 | 2012-05-21 19:50:07 -0700 | [diff] [blame] | 600 | pr_info("Ignoring P6 Local APIC Spurious Interrupt Bug...\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 601 | #endif |
| 602 | } |
| 603 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 604 | asmlinkage void __attribute__((weak)) smp_thermal_interrupt(void) |
| 605 | { |
| 606 | } |
| 607 | |
Andi Kleen | 7856f6c | 2009-04-28 23:32:56 +0200 | [diff] [blame] | 608 | asmlinkage void __attribute__((weak)) smp_threshold_interrupt(void) |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 609 | { |
| 610 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 611 | |
| 612 | /* |
Linus Torvalds | 34ddc81 | 2012-02-18 12:56:35 -0800 | [diff] [blame] | 613 | * 'math_state_restore()' saves the current math information in the |
| 614 | * old math state array, and gets the new ones from the current task |
| 615 | * |
| 616 | * Careful.. There are problems with IBM-designed IRQ13 behaviour. |
| 617 | * Don't touch unless you *really* know how it works. |
| 618 | * |
| 619 | * Must be called with kernel preemption disabled (eg with local |
| 620 | * local interrupts as in the case of do_device_not_available). |
| 621 | */ |
| 622 | void math_state_restore(void) |
| 623 | { |
| 624 | struct task_struct *tsk = current; |
| 625 | |
| 626 | if (!tsk_used_math(tsk)) { |
| 627 | local_irq_enable(); |
| 628 | /* |
| 629 | * does a slab alloc which can sleep |
| 630 | */ |
| 631 | if (init_fpu(tsk)) { |
| 632 | /* |
| 633 | * ran out of memory! |
| 634 | */ |
| 635 | do_group_exit(SIGKILL); |
| 636 | return; |
| 637 | } |
| 638 | local_irq_disable(); |
| 639 | } |
| 640 | |
| 641 | __thread_fpu_begin(tsk); |
Suresh Siddha | 304bced | 2012-08-24 14:13:02 -0700 | [diff] [blame] | 642 | |
Linus Torvalds | 80ab6f1 | 2012-02-19 11:48:44 -0800 | [diff] [blame] | 643 | /* |
| 644 | * Paranoid restore. send a SIGSEGV if we fail to restore the state. |
| 645 | */ |
| 646 | if (unlikely(restore_fpu_checking(tsk))) { |
Suresh Siddha | 304bced | 2012-08-24 14:13:02 -0700 | [diff] [blame] | 647 | drop_init_fpu(tsk); |
Linus Torvalds | 80ab6f1 | 2012-02-19 11:48:44 -0800 | [diff] [blame] | 648 | force_sig(SIGSEGV, tsk); |
| 649 | return; |
| 650 | } |
Linus Torvalds | b3b0870 | 2012-02-16 15:45:23 -0800 | [diff] [blame] | 651 | |
Vineet Gupta | c375f15 | 2013-11-12 15:08:46 -0800 | [diff] [blame] | 652 | tsk->thread.fpu_counter++; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | } |
Rusty Russell | 5992b6d | 2007-07-19 01:49:21 -0700 | [diff] [blame] | 654 | EXPORT_SYMBOL_GPL(math_state_restore); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 656 | dotraplinkage void __kprobes |
Brian Gerst | aa78bcf | 2009-02-10 09:51:45 -0500 | [diff] [blame] | 657 | do_device_not_available(struct pt_regs *regs, long error_code) |
Alexander van Heukelum | 7643e9b | 2008-09-09 21:56:02 +0200 | [diff] [blame] | 658 | { |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 659 | enum ctx_state prev_state; |
| 660 | |
| 661 | prev_state = exception_enter(); |
Suresh Siddha | 5d2bd70 | 2012-09-06 14:58:52 -0700 | [diff] [blame] | 662 | BUG_ON(use_eager_fpu()); |
Suresh Siddha | 304bced | 2012-08-24 14:13:02 -0700 | [diff] [blame] | 663 | |
Brian Gerst | a334fe4 | 2010-09-03 21:17:15 -0400 | [diff] [blame] | 664 | #ifdef CONFIG_MATH_EMULATION |
Alexander van Heukelum | 7643e9b | 2008-09-09 21:56:02 +0200 | [diff] [blame] | 665 | if (read_cr0() & X86_CR0_EM) { |
Tejun Heo | d315760 | 2009-02-09 22:17:39 +0900 | [diff] [blame] | 666 | struct math_emu_info info = { }; |
| 667 | |
Alexander van Heukelum | 7643e9b | 2008-09-09 21:56:02 +0200 | [diff] [blame] | 668 | conditional_sti(regs); |
Tejun Heo | d315760 | 2009-02-09 22:17:39 +0900 | [diff] [blame] | 669 | |
Brian Gerst | aa78bcf | 2009-02-10 09:51:45 -0500 | [diff] [blame] | 670 | info.regs = regs; |
Tejun Heo | d315760 | 2009-02-09 22:17:39 +0900 | [diff] [blame] | 671 | math_emulate(&info); |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 672 | exception_exit(prev_state); |
Brian Gerst | a334fe4 | 2010-09-03 21:17:15 -0400 | [diff] [blame] | 673 | return; |
Alexander van Heukelum | 7643e9b | 2008-09-09 21:56:02 +0200 | [diff] [blame] | 674 | } |
Brian Gerst | a334fe4 | 2010-09-03 21:17:15 -0400 | [diff] [blame] | 675 | #endif |
| 676 | math_state_restore(); /* interrupts still off */ |
| 677 | #ifdef CONFIG_X86_32 |
| 678 | conditional_sti(regs); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 679 | #endif |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 680 | exception_exit(prev_state); |
Alexander van Heukelum | 7643e9b | 2008-09-09 21:56:02 +0200 | [diff] [blame] | 681 | } |
| 682 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 683 | #ifdef CONFIG_X86_32 |
Alexander van Heukelum | e407d620 | 2008-09-30 18:41:36 +0200 | [diff] [blame] | 684 | dotraplinkage void do_iret_error(struct pt_regs *regs, long error_code) |
Alexander van Heukelum | f8e0870 | 2008-09-09 21:56:13 +0200 | [diff] [blame] | 685 | { |
| 686 | siginfo_t info; |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 687 | enum ctx_state prev_state; |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 688 | |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 689 | prev_state = exception_enter(); |
Alexander van Heukelum | f8e0870 | 2008-09-09 21:56:13 +0200 | [diff] [blame] | 690 | local_irq_enable(); |
| 691 | |
| 692 | info.si_signo = SIGILL; |
| 693 | info.si_errno = 0; |
| 694 | info.si_code = ILL_BADSTK; |
Hannes Eder | fc6fcdf | 2009-02-22 01:00:57 +0100 | [diff] [blame] | 695 | info.si_addr = NULL; |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 696 | if (notify_die(DIE_TRAP, "iret exception", regs, error_code, |
Frederic Weisbecker | 6ba3c97 | 2012-07-11 20:26:35 +0200 | [diff] [blame] | 697 | X86_TRAP_IRET, SIGILL) != NOTIFY_STOP) { |
| 698 | do_trap(X86_TRAP_IRET, SIGILL, "iret exception", regs, error_code, |
| 699 | &info); |
| 700 | } |
Frederic Weisbecker | 6c1e025 | 2013-02-24 01:19:14 +0100 | [diff] [blame] | 701 | exception_exit(prev_state); |
Alexander van Heukelum | f8e0870 | 2008-09-09 21:56:13 +0200 | [diff] [blame] | 702 | } |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 703 | #endif |
Alexander van Heukelum | f8e0870 | 2008-09-09 21:56:13 +0200 | [diff] [blame] | 704 | |
Jan Kiszka | 29c8439 | 2010-05-20 21:04:29 -0500 | [diff] [blame] | 705 | /* Set of traps needed for early debugging. */ |
| 706 | void __init early_trap_init(void) |
| 707 | { |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 708 | set_intr_gate_ist(X86_TRAP_DB, &debug, DEBUG_STACK); |
Jan Kiszka | 29c8439 | 2010-05-20 21:04:29 -0500 | [diff] [blame] | 709 | /* int3 can be called from all */ |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 710 | set_system_intr_gate_ist(X86_TRAP_BP, &int3, DEBUG_STACK); |
H. Peter Anvin | 8170e6b | 2013-01-24 12:19:52 -0800 | [diff] [blame] | 711 | #ifdef CONFIG_X86_32 |
Seiji Aguchi | 25c74b1 | 2013-10-30 16:37:00 -0400 | [diff] [blame] | 712 | set_intr_gate(X86_TRAP_PF, page_fault); |
H. Peter Anvin | 8170e6b | 2013-01-24 12:19:52 -0800 | [diff] [blame] | 713 | #endif |
Jan Kiszka | 29c8439 | 2010-05-20 21:04:29 -0500 | [diff] [blame] | 714 | load_idt(&idt_descr); |
| 715 | } |
| 716 | |
H. Peter Anvin | 8170e6b | 2013-01-24 12:19:52 -0800 | [diff] [blame] | 717 | void __init early_trap_pf_init(void) |
| 718 | { |
| 719 | #ifdef CONFIG_X86_64 |
Seiji Aguchi | 25c74b1 | 2013-10-30 16:37:00 -0400 | [diff] [blame] | 720 | set_intr_gate(X86_TRAP_PF, page_fault); |
H. Peter Anvin | 8170e6b | 2013-01-24 12:19:52 -0800 | [diff] [blame] | 721 | #endif |
| 722 | } |
| 723 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | void __init trap_init(void) |
| 725 | { |
Rusty Russell | dbeb2be | 2007-10-19 20:35:03 +0200 | [diff] [blame] | 726 | int i; |
| 727 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 728 | #ifdef CONFIG_EISA |
Ingo Molnar | 927222b | 2008-01-30 13:33:49 +0100 | [diff] [blame] | 729 | void __iomem *p = early_ioremap(0x0FFFD9, 4); |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 730 | |
| 731 | if (readl(p) == 'E' + ('I'<<8) + ('S'<<16) + ('A'<<24)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 732 | EISA_bus = 1; |
Ingo Molnar | 927222b | 2008-01-30 13:33:49 +0100 | [diff] [blame] | 733 | early_iounmap(p, 4); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 734 | #endif |
| 735 | |
Seiji Aguchi | 25c74b1 | 2013-10-30 16:37:00 -0400 | [diff] [blame] | 736 | set_intr_gate(X86_TRAP_DE, divide_error); |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 737 | set_intr_gate_ist(X86_TRAP_NMI, &nmi, NMI_STACK); |
Alexander van Heukelum | 699d293 | 2008-10-03 22:00:32 +0200 | [diff] [blame] | 738 | /* int4 can be called from all */ |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 739 | set_system_intr_gate(X86_TRAP_OF, &overflow); |
Seiji Aguchi | 25c74b1 | 2013-10-30 16:37:00 -0400 | [diff] [blame] | 740 | set_intr_gate(X86_TRAP_BR, bounds); |
| 741 | set_intr_gate(X86_TRAP_UD, invalid_op); |
| 742 | set_intr_gate(X86_TRAP_NM, device_not_available); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 743 | #ifdef CONFIG_X86_32 |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 744 | set_task_gate(X86_TRAP_DF, GDT_ENTRY_DOUBLEFAULT_TSS); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 745 | #else |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 746 | set_intr_gate_ist(X86_TRAP_DF, &double_fault, DOUBLEFAULT_STACK); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 747 | #endif |
Seiji Aguchi | 25c74b1 | 2013-10-30 16:37:00 -0400 | [diff] [blame] | 748 | set_intr_gate(X86_TRAP_OLD_MF, coprocessor_segment_overrun); |
| 749 | set_intr_gate(X86_TRAP_TS, invalid_TSS); |
| 750 | set_intr_gate(X86_TRAP_NP, segment_not_present); |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 751 | set_intr_gate_ist(X86_TRAP_SS, &stack_segment, STACKFAULT_STACK); |
Seiji Aguchi | 25c74b1 | 2013-10-30 16:37:00 -0400 | [diff] [blame] | 752 | set_intr_gate(X86_TRAP_GP, general_protection); |
| 753 | set_intr_gate(X86_TRAP_SPURIOUS, spurious_interrupt_bug); |
| 754 | set_intr_gate(X86_TRAP_MF, coprocessor_error); |
| 755 | set_intr_gate(X86_TRAP_AC, alignment_check); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | #ifdef CONFIG_X86_MCE |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 757 | set_intr_gate_ist(X86_TRAP_MC, &machine_check, MCE_STACK); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | #endif |
Seiji Aguchi | 25c74b1 | 2013-10-30 16:37:00 -0400 | [diff] [blame] | 759 | set_intr_gate(X86_TRAP_XF, simd_coprocessor_error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | |
Yinghai Lu | bb3f0b5 | 2009-01-25 02:38:09 -0800 | [diff] [blame] | 761 | /* Reserve all the builtin and the syscall vector: */ |
| 762 | for (i = 0; i < FIRST_EXTERNAL_VECTOR; i++) |
| 763 | set_bit(i, used_vectors); |
| 764 | |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 765 | #ifdef CONFIG_IA32_EMULATION |
| 766 | set_system_intr_gate(IA32_SYSCALL_VECTOR, ia32_syscall); |
Yinghai Lu | bb3f0b5 | 2009-01-25 02:38:09 -0800 | [diff] [blame] | 767 | set_bit(IA32_SYSCALL_VECTOR, used_vectors); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 768 | #endif |
| 769 | |
| 770 | #ifdef CONFIG_X86_32 |
Alexander van Heukelum | 699d293 | 2008-10-03 22:00:32 +0200 | [diff] [blame] | 771 | set_system_trap_gate(SYSCALL_VECTOR, &system_call); |
Rusty Russell | dbeb2be | 2007-10-19 20:35:03 +0200 | [diff] [blame] | 772 | set_bit(SYSCALL_VECTOR, used_vectors); |
Alexander van Heukelum | 081f75b | 2008-10-03 22:00:39 +0200 | [diff] [blame] | 773 | #endif |
Yinghai Lu | bb3f0b5 | 2009-01-25 02:38:09 -0800 | [diff] [blame] | 774 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | /* |
Kees Cook | 4eefbe7 | 2013-04-10 12:24:22 -0700 | [diff] [blame] | 776 | * Set the IDT descriptor to a fixed read-only location, so that the |
| 777 | * "sidt" instruction will not leak the location of the kernel, and |
| 778 | * to defend the IDT against arbitrary memory write vulnerabilities. |
| 779 | * It will be reloaded in cpu_init() */ |
| 780 | __set_fixmap(FIX_RO_IDT, __pa_symbol(idt_table), PAGE_KERNEL_RO); |
| 781 | idt_descr.address = fix_to_virt(FIX_RO_IDT); |
| 782 | |
| 783 | /* |
Ingo Molnar | b596440 | 2008-02-26 11:15:50 +0100 | [diff] [blame] | 784 | * Should be a barrier for any external CPU state: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | */ |
| 786 | cpu_init(); |
| 787 | |
Thomas Gleixner | 428cf90 | 2009-08-20 10:35:46 +0200 | [diff] [blame] | 788 | x86_init.irqs.trap_init(); |
Steven Rostedt | 228bdaa | 2011-12-09 03:02:19 -0500 | [diff] [blame] | 789 | |
| 790 | #ifdef CONFIG_X86_64 |
Seiji Aguchi | 629f4f9 | 2013-06-20 11:45:44 -0400 | [diff] [blame] | 791 | memcpy(&debug_idt_table, &idt_table, IDT_ENTRIES * 16); |
Kees Cook | c940826 | 2012-03-09 16:07:10 -0800 | [diff] [blame] | 792 | set_nmi_gate(X86_TRAP_DB, &debug); |
| 793 | set_nmi_gate(X86_TRAP_BP, &int3); |
Steven Rostedt | 228bdaa | 2011-12-09 03:02:19 -0500 | [diff] [blame] | 794 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 795 | } |